CA2371094A1 - Process and device for supplying current to an electric-arc melting unit - Google Patents

Process and device for supplying current to an electric-arc melting unit Download PDF

Info

Publication number
CA2371094A1
CA2371094A1 CA002371094A CA2371094A CA2371094A1 CA 2371094 A1 CA2371094 A1 CA 2371094A1 CA 002371094 A CA002371094 A CA 002371094A CA 2371094 A CA2371094 A CA 2371094A CA 2371094 A1 CA2371094 A1 CA 2371094A1
Authority
CA
Canada
Prior art keywords
current
phase
electrode
unit
melting
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
CA002371094A
Other languages
French (fr)
Inventor
Dirk Breker
Bernhard Espendiller
Guido Grund
Klaus Schmale
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SMS Siemag AG
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of CA2371094A1 publication Critical patent/CA2371094A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/08—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces heated electrically, with or without any other source of heat
    • F27B3/085—Arc furnaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
    • F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
    • F27B3/28—Arrangement of controlling, monitoring, alarm or the like devices
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H02M5/42—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters
    • H02M5/44—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac
    • H02M5/453—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal
    • H02M5/458—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M5/4585—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc by static converters using discharge tubes or semiconductor devices to convert the intermediate dc into ac using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only having a rectifier with controlled elements
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/005—Electrical diagrams
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00—Heating by electric discharge
    • H05B7/02—Details
    • H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Furnace Details (AREA)
  • Discharge Heating (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Arc Welding Control (AREA)

Abstract

The invention relates to a method and to a device for supplying an electric arc melting furnace with current. Said melting furnace is used to melt and heat metal, especially steel. The inventive device comprises a three-phase current source that supplies the current via means for generating a direct current or an alternating current to at least one electrode that projects in to the melting ladle of the melting furnace. At least two parallel current supp ly modules (41, 4n) are mounted downstream of said three-phase current source (91). Every current supply module (41, 4n) has an uncontrolled three-phase bridge (51, 5n), a direct current intermediate circuit (61, 6n) and a transistor element (71, 7n) connected in series. A common current supply (31 ) to at least one electrode (21) of the melting furnace (11) and from at least one further electrode (22 or 24) is provided downstream of the current suppl y modules (41, 4n) in the current direction.

Description

a TRANSLATION (5095-481:
WO 00/65,878 A3 PCT/DE00/01,305 PROCESS AND DEVICE FOR SUPPLYING CURRENT
TO AN ELECTRIC-ARC MELTING UNIT
S P E C I F I C A T I O N
The invention pertains to a process and a corresponding device for sup-plying current to an electric-arc melting unit for melting and heating metal, especially steel, which unit is operated with at least two electrodes.
Metals, especially steel, are usually melted and heate=d in melting units by means of arcs. these electrically operated melting unit=s, especially arc furnaces, are operated with either direct current, [single-phase -- Tr. Ed.]
alternating current, or three-phase alternating current. At least one elec-trode, which passes through the furnace cover and projects into the furnace vessel, is usually used, whereas the other electrodes are either installed like the first or installed in the bottom of the melting ve>ssel.
An arc furnace for the melting and refining of metal, especially steel scrap, is known from DE-OS 2,510,326. The furnace can be operated with a di-rect-current source and has at least one electrode of a certain polarity. The electrode is mounted in the treatment vessel so that it can make contact with the charge. The furnace also has a number of other electrodes of the opposite polarity, which project into the vessel above the charge. The required elec-tric current is supplied to this known furnace by way of a star-delta-connect-ed transformer. The various phases of the secondary windings of the trans-former are connected separately to the phase inputs of a full-wave rectifier.
This known system for supplying the arc with current provides no devices for preventing feedback effects on the mains, nor can the electric power be adjusted to a desired value to melt the charge.

A direct-current electric-art furnace with an electrode designed as a cathode projecting into the furnace vessel and at least two bottom electrodes is known from DE 4,138,756 C2, where the electrodes are connected by current-carrying lines to cor~troilable rectifiers. At least two sets of 5--pole thy-ristors are used as rectifiers.
The object of the above-cited document is an attempt to solve the prcblem of how to influence the arc in a direct-current arc furnace. The disadvan-tapes inherent in the proposed system such as the undesirably high mains feed-back effer_ts, poor electrical efficiency, and limited system availabi.litw are accepted in return for the ability tc control the arc.
A device for supplying a melting unit with direct current is known. froar;
DE 195-36,545. This device represents an attempt to solve the problem of how to reduce the mains feedback effects of th~rristor control elements. It is known from this document. that a certa:~n effect can be exerted on the fee:~.il-~a<:~:
by controlling the firing angles, but the mains feedback effects whir_~h .occur can be decreased to only a :.invited extenr_. This solution a7.so suffers Pram the disadvantage that the ~~elting capacity of the system is limited after t.~~e failure of one or more components. In addition, the selee:ted type of asymm~yr--rically controlled firing angles for the thyristor control ele;nerat:s Seam ro interharmonic ripple currents, which represent an undesirable load o~: ~-iue mains.
A device is known from EP 0,4;:9,774 A7., which focuses on the pr.:~b'.e~r, :vf redur_ing the mains feedback effects of three-p:lase a.c. f:urnaces. .For thi~.>
purpose, a controllable choke is proposed, which is connected t.~ the input circuit of the current-supplying three-phase transformer.
The object according to thi;5 document, however, can reduce the feedba~.l~
to the mains only to a limited extent, because the power capacity of the choke connected to the input side has ,an effect on the' process technology behavior of the arc. Thus, additional equipment is usually required to reduce the mains feedback effects to the required extent.
The goal of the invention is to create a process and a corresponding de-vice for supplying current to an electric arc for the melting of metal, espe-cially steel, in which, by the use of a simple design, mains feedback effects are reduced to a minimum, the electrical efficiency is increased, and the ser-vice life of the working materials of the melting unit is simultaneously pro-longed.
The invention achieves this goal by means of the features of Process Claim 1 and the features of Device Claim 8.
According to the invention, the electric current from the mains to a three-phase a.c. source is divided over at least two power supply modules con-nected in parallel to each other.
Each of the individual power supply modules has an uncontrolled three-phase bridge, a direct-current intermediate circuit, and a transistor unit connected in series in the current flow direction. In each branch circuit, the current is introduced as direct current by the three-phase bridge and stored temporarily in the individual direct-current intermediate circuits.
The rectified partial circuits [sic; presumably "partial currents" isee fur-ther on, e.g., Claim S) -- Tr. Ed.] are then controlled individually by the transistor units and sent via current-carrying lines to the individual elec-trodes and back again.
The storage capacities of the individual direct-current intermediate cir-cuits are designed to compensate for the voltage variation:> arising as a re-sult of the operation of the arc or arcs. This ensures that the load imposed on the mains power supply remains uniform. The individual current modules are designed in such a way and provided in such number that the reactive power uptake of the power supply unit can be kept constant.
In addition, the number of power supply modules is selected so that, when there is a problem with the working materials, the process can be continued without interruption or limitation of the required power while certain spe-cific modules or components are removed.
In an advantageous design, the transistor units of each power supply mod-ule are provided with components by means of which the level of the current and its form can be controlled in correspondence with the power required for the melting process while the power factor is kept constant at the same time.
In addition, each of the transistor units is connected to a control unit, by means of which the type of current can be selected. It is possible accord-ing to the invention to use the proposed power supply to generate direct cur-rent, single-phase alternating current, or three-phase alternating current.
The melting unit connected via current-carrying lines to the power supply has electrodes appropriate to the type of current, which electrodes either project down into the furnace vessel from above or are designed as bottom electrodes.
The power supply modules can be connected individually or in groups to phase-shifted, three-phase power sources. This improves t:te feedback effects on the mains by reducing the ripple currents resulting from the characteristic of an n x 6-pulse circuit design.
An example of the invention is shown in the attached drawing:
- Figure 1 shows the power supply for direct current;
- Figure 2 shows the power supply for single-phase alternating current;
and - Figure 3 shows the power supply for three-phase alternating current.
Figures 1-3 show a melting unit 11, which has a vessel 12 with a bottom I3, into which the metal charge S has been placed. Electrodes 21 and/or 22 and/or 23 project into the vessel. In Figure 1 a bottom electrode 24 is also provided in the bottom 13 of the melting unit 11.
In all three figures, a three-phase a.c. source 91 is present, which is connected to the mains (not shown). The three-phase a.c. e.ource 91 is con-netted to at least two power supply modules 4I, 42 and possibly to as many as 4n modules. Each power supply module 41-4n has a three-ph~.se bridge 51-5n, an intermediate circuit 61-6n, and a transistor unit 71-7n, connected in series with it. On the output side, the transistor units 71-7n are connected to the electrodes by a current-carrying line 31 and a return line 34 or by go-and-return lines 32, 33, 35. In addition, the transistor units 71-7n are con-netted to a control unit 81 by appropriate control lines; =n Figure 1, they are wired for direct current and in Figures 2 and 3 for alternating and 3-phase current, respectively.
In Figure 2, the electrodes 21, 22 project into the fu-nace vessel 12;
they are connected via current-carrying lines 32, 33 to the transistor units 71-7n. The individual transistor units 71-7n have components 82, by means of which the level of the current can be controlled in corresNondence with the power required during the melting process while keeping the po-,~:er factor the same.
In Figure 3, three electrodes 21-23 in all project in~o the furnace ves-sel 12 and are connected via current-carrying lines 32, 33, 35 to the ind!:~i~a-ual transistor units 71.i, 71.2, 71.3 to 7n.1, 7n.2, and 7:.3.
In addition, the transistor units 71.1-7n.3 are connected by appr-:~;.;~-..ta control lines to the control device 81; these transistor units are used ro form alternating currents, the sum of which, forming 3-phase alternating cur-rents, is sent to at least three electrodes 2I-23 in the vessel 12 and re-turned again via the three current-carrying lines 32, 33, 35.

List of Items Melting 11 melting unit 12 vessel 13 Bottom Electrode System 21 lst electrode or electrode set 22 2°d electrode or electrode set 23 3rd electrode or electrode set 24 bottom electrode or bottom electrode set Current-Conductors 31 1Stcurrent-carryingline,go 32 1Stcurrent-carryingline,go/return 33 2n~current-carryingline,go/return 34 2ndcurrent-carryingline,return 35 3rdcurrent-carryingline,go/return 36 3'3current-carryingline,return [not in the figures --Tr. Ed.]

Modules 41-4n lst to n-th power supply module Bridges 51-5n 1St to n-th three-phase bridge Intermediate Circuits 61-6n lst to n-th d.c. intermediate circuit 71-7n ls' to n-th transistor unit 81 control unit 82 components for current control

Claims (14)

CLAIM(S)
1. Process for supplying current to an electric-arc melting unit for melting and heating metal, especially steel, which unit is operated with at least two electrodes, characterized by the following steps:

(a) the electric current from the mains to a three-phase a.c. source is divided over at least two parallel power supply modules;

(b) in each power supply module, the current is introduced as direct cur-rent via an uncontrolled three-phase bridge;

(c) then the current is stored temporarily in individual direct-current intermediate circuits;

(d) the rectified partial current circuits [sic; just "currents"? -- Tr.
Ed.] are controlled individually by transistor units and then (e) brought together in a first current-carrying line and sent to an electrode of the melting unit and, as a function of the selected type of cur-rent, returned over a second or third current-carrying from a second and/or a third electrode or set of electrodes.
2. Process according to Claim 1, characterized in that the primary power factor of the power supply unit is kept at a constant high level by the three-phase bridge connected to the input side.
3. Process according to Claim 1, characterized in that, relative to their capacitance, the individual d.c. intermediate circuits are supplied with an amount of current at which the arc will not exert any negative feedback on the mains regardless of the variations in the load.
4. Process according to Claim 1, characterized in that the phase shift of the three-phase a.c. source is divided in n-fold phase-shifted windings in such a way that its characteristic corresponds to an n x 6-pulse circuit de-sign.
5. Process according to one of Claims 1-4, characterized in that the rectified partial currents are controlled by the transistor units in such a way that the current conducted to the first current-carrying line is a direct current, which is sent to at least one electrode designed as a cathode.
6. Process according to one of Claims 1-4, characterized in that the rectified partial currents are controlled by the transistor units in such a way that the current conducted to the current-carrying line is a single-phase alternating current.
7. Process according to one of Claims 1-4, characterized in that three of the rectified partial currents, which are electrically phase-shifted by 120° by the transistor units, form a three-phase a.c. unit, which is sent over three current-carrying lines as three-phase alternating current to at least three electrodes assigned to the melting unit and returned again.
8. Device for supplying current to an electric-arc melting unit for melting and heating metal, especially steel, with a three-phase a.c. source, which sends the current via devices for producing direct or alternating cur-rent to at least one electrode projecting into the vessel of the melting unit, for implementing the process according to Claim 1, characterized in that the three-phase a.c. source (91) is followed by at least two power supply modules (41, 4n) connected in parallel to each other; in that each power supply module (41, 4n) has an uncontrolled three-phase bridge (51, 5n), a direct-current in-termediate circuit (61, 6n), and a transistor unit (71, 7n), connected in se-ries; and in that, downline from the power supply modules (41, 4n), a common current-carrying line (31) leading to at least one electrode (21) of the melt-ing unit (11) and away from at least one other electrode (22, 24) is provided.
9. Device for supplying current according to Claim 8, characterized in that the three-phase bridge (51, 5n) is uncontrolled, and in that it can be used to feed a direct-current intermediate circuit (61, 6n) connected in se-ries with it.
10. Device for supplying current according to Claim 9, characterized in that the transistor units (71, 7n) contain components (82) by means of which the level of the current can be controlled in correspondence with the power required during the melting process while keeping the power factor constant.
11. Device for supplying current according to Claim 10, characterized in that the transistor units (71, 7n) are connected to control devices (81), by means of which direct currents can be formed, which can be sent over a first current-carrying line (31) to at least one electrode (21) in the vessel (12) of the melting unit (11) and back from the vessel (12) via at least one second electrode (22), especially a bottom electrode or set of bottom electrodes (24).
12. Device for supplying current according to Claim 10, characterized in that the transistor units (71, 7n) are connected to control devices (81), by means of which single-phase alternating currents can be foamed, which can be sent via current-carrying lines (31, 32) to at least two electrodes (21, 22) in the vessel (12) of the melting unit (11) and returned from them.
13. Device for supplying current according to Claim 10, characterized in that the transistor units (71, 7n) are connected to control devices (81), by means of which alternating currents can be formed, the sum of which, forming three-phase alternating currents, can be sent via three current-carrying lines (32, 33, 35) to at least three electrodes (21, 22, 23 and/or 24) provided in the vessel (12) and also returned from them.
14. Device for supplying current according to Claim 13, characterized in that the control devices (81) connected to the transistor units (71, 7n) form alternating currents, which are shifted electrically by 120° from each other.
CA002371094A 1999-04-23 2000-04-20 Process and device for supplying current to an electric-arc melting unit Abandoned CA2371094A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19920049A DE19920049C2 (en) 1999-04-23 1999-04-23 Method and device for the power supply of a melting unit operated via an arc
DE19920049.1 1999-04-23
PCT/DE2000/001305 WO2000065878A2 (en) 1999-04-23 2000-04-20 Method and device for supplying an electric arc melting furnace with current

Publications (1)

Publication Number Publication Date
CA2371094A1 true CA2371094A1 (en) 2000-11-02

Family

ID=7906642

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002371094A Abandoned CA2371094A1 (en) 1999-04-23 2000-04-20 Process and device for supplying current to an electric-arc melting unit

Country Status (15)

Country Link
US (1) US6421366B1 (en)
EP (1) EP1174004B1 (en)
JP (1) JP2002543569A (en)
KR (1) KR20020008159A (en)
CN (1) CN1354968A (en)
AT (1) ATE233465T1 (en)
AU (1) AU5388800A (en)
BR (1) BR0009989A (en)
CA (1) CA2371094A1 (en)
DE (2) DE19920049C2 (en)
EA (1) EA004169B1 (en)
MX (1) MXPA01009778A (en)
UA (1) UA59489C2 (en)
WO (1) WO2000065878A2 (en)
ZA (1) ZA200108683B (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2829312B1 (en) * 2001-08-29 2005-02-11 Electricite De France DC POWER SUPPLY DEVICE FOR ARC OVEN
US7655160B2 (en) * 2005-02-23 2010-02-02 Electromagnetics Corporation Compositions of matter: system II
CN100455967C (en) * 2005-07-18 2009-01-28 宝山钢铁股份有限公司 Simulation analogue regulator for DC electric arc furnace control and protective function
DE502006001831D1 (en) * 2006-04-21 2008-11-27 Abb Schweiz Ag Arc furnace power supply device
EP1931023A1 (en) * 2006-12-06 2008-06-11 ABB Schweiz AG DC power supply system
WO2009147551A1 (en) * 2008-06-02 2009-12-10 Philips Intellectual Property & Standards Gmbh Scalable power supply system for providing electrical power for a computer tomography device
DE102008049610A1 (en) * 2008-09-30 2010-04-08 Siemens Aktiengesellschaft Power supply system for a three-phase electric arc furnace with DC link converter between mains connection and furnace transformer
EP2364058B1 (en) * 2010-03-05 2013-10-23 AEG Power Solutions B.V. Power supply assembly
DE102010042781A1 (en) * 2010-10-21 2012-04-26 Ald Vacuum Technologies Gmbh Apparatus and method for filtering utility network noise from an electrode signal in a metallurgical electrofusion process
JP5819977B2 (en) 2010-11-22 2015-11-24 エレクトロマグネティクス コーポレーション Device for tailoring substances
EP2821743A1 (en) * 2013-07-04 2015-01-07 Siemens VAI Metals Technologies GmbH Method for operating an arc furnace and arc furnace
DE102014206008A1 (en) * 2014-03-31 2015-10-01 Siemens Aktiengesellschaft Apparatus and method for dynamically adjusting an electric arc furnace
WO2016045722A1 (en) * 2014-09-24 2016-03-31 Siemens Aktiengesellschaft Electrical arrangement and method for generating a direct current
ITUB20152674A1 (en) 2015-07-30 2017-01-30 Danieli Automation Spa APPARATUS AND METHOD OF ELECTRIC SUPPLY OF AN ARC ELECTRIC OVEN
CN105680709B (en) * 2016-03-11 2018-02-02 中国计量学院 Prime parallel connection rear class parallel connection type modularization AC DC DC converters
CN110094965B (en) * 2018-02-11 2024-04-02 于文 Novel direct-current smelting electric furnace
IT201800004847A1 (en) * 2018-04-24 2019-10-24 METHOD OF MELTING IN AN ELECTRIC ARC OVEN AND RELATED EQUIPMENT
CN111394539B (en) * 2020-04-17 2022-04-29 中冶京诚工程技术有限公司 DC control method and device for three-phase AC electric arc furnace
IT202100007892A1 (en) * 2021-03-30 2022-09-30 Danieli Automation Spa ELECTRIC POWER SUPPLY APPARATUS
CN113937705B (en) * 2021-10-15 2023-02-24 中铁第一勘察设计院集团有限公司 Alternating-current ice melting device for railway traction network and control method thereof

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1488877A (en) * 1974-03-12 1977-10-12 British Steel Corp Arc furnaces
US3999117A (en) * 1974-12-23 1976-12-21 Westinghouse Electric Corporation Method and control apparatus for static VAR generator and compensator
JPS63242135A (en) * 1987-03-27 1988-10-07 三菱電機株式会社 Reactive power compensator
IT1236363B (en) * 1989-11-30 1993-02-25 Danieli Off Mecc DIRECT CURRENT ELECTRIC ARC OVEN AND CONTROLLED CURRENT SUPPLY PROCEDURE OF A DIRECT ARC ARC OVEN
DE4118756C2 (en) * 1991-06-06 1995-11-30 Mannesmann Ag DC arc furnace
FR2704710B1 (en) * 1993-04-30 1995-06-23 Cegelec Metals Systems Improved power converter device for supplying direct current to an electric arc furnace.
DE4327894A1 (en) * 1993-08-19 1995-02-23 Abb Management Ag Method for stabilizing a power grid against fluctuations in reactive load and reactive power compensation device
DE4343899A1 (en) * 1993-12-22 1995-06-29 Abb Management Ag Control method for a direct current arc furnace
DE19536545A1 (en) * 1995-09-29 1997-04-03 Siemens Ag Device for direct current supply
DE19623540C1 (en) * 1996-06-13 1997-12-18 Asea Brown Boveri Method for stabilizing an AC network against fluctuations in reactive power and reactive power compensation device

Also Published As

Publication number Publication date
ATE233465T1 (en) 2003-03-15
DE19920049C2 (en) 2001-10-11
DE50001330D1 (en) 2003-04-03
ZA200108683B (en) 2003-04-30
UA59489C2 (en) 2003-09-15
US6421366B1 (en) 2002-07-16
WO2000065878A2 (en) 2000-11-02
MXPA01009778A (en) 2002-07-30
EA004169B1 (en) 2004-02-26
EP1174004A2 (en) 2002-01-23
EA200100960A1 (en) 2002-04-25
DE19920049A1 (en) 2000-11-02
CN1354968A (en) 2002-06-19
KR20020008159A (en) 2002-01-29
EP1174004B1 (en) 2003-02-26
JP2002543569A (en) 2002-12-17
BR0009989A (en) 2002-01-08
WO2000065878A3 (en) 2001-04-26
AU5388800A (en) 2000-11-10

Similar Documents

Publication Publication Date Title
CA2371094A1 (en) Process and device for supplying current to an electric-arc melting unit
CN113915991B (en) Electric power method of electric furnace
CN101099413B (en) Control apparatus for alternating-current reduction furnaces
JP2009506743A (en) Pulse width modulation power inverter output control
US4818836A (en) Power supply for a three-phase plasma heating unit
CA1101499A (en) Welding power supply
CN101658066B (en) Current fed inverter with pulse regulator for electric induction heating, melting and stirring
CN101091416A (en) Electronic circuit and method for electric power supply to an alternative current electric furnace
US11146067B2 (en) Line control circuit configuration
US3857697A (en) Method of continuously smelting a solid material rich in iron metal in an electric arc furnace
RU2104450C1 (en) Method of electric melting and electric arc furnace for its realization
US6246218B1 (en) Method and control device for stabilizing a power supply network
JP2910052B2 (en) DC arc furnace
RU2199838C2 (en) Power converter for supplying electric arc furnace with dc current
RU2216883C2 (en) Power supply for dc arc furnace
JP3300080B2 (en) Electric furnace equipment
JP4564648B2 (en) DC power supply for electric resistance ash melting furnace
WO2023166223A1 (en) Furnace power supply apparatus, system for the power supply of an electric arc furnace or a submerged arc-resistance furnace, electric arc furnace or submerged arc-resistance furnace and operating method
WO2023157034A1 (en) Method to supply electric power to furnaces for melting and/or haeting metal materials, and corresponding apparatus
PL160731B1 (en) Power supply circuit for an electric furnace in particular a rotary one
RU2088674C1 (en) Method of conducting smelting in three-electrode arc furnace
RU1790321C (en) Dc source for power supply of arc furnace
JPH10300048A (en) Three phase ac electric resistance melting furnace and its operation method
JPH01313891A (en) Dc arc furnace
HU200870B (en) Plasma-arc induction furnqce

Legal Events

Date Code Title Description
FZDE Discontinued